.net Register Event Callback error 1172

[Lotob93]

I'm trying to implement an OPC UA client based on the .net sdk of the OPC foundation.

when registering an event, error 1172 occurs.

LabVIEW: (Hex 0x494) A .NET exception occurred in an external assembly. For information about correcting this error, copy the following exception (in bold), and search the Microsoft Developer Network (MSDN) Web site or the Web for a possible explanation.

I found some instructions which should solve this probelm, but nothing worked (restart workstation in windows services or run the code as admin).

I'm working in LV 2018

[aptivo]

Wire the error connector of this register Event callback with an error indicator. You should obtain more information on the error afterwards.

[Lotob93]

Thank you for your answer. I tried it but unfortunately did not receive any further information.
However, I found that I have an error in one of the references, could now fix the problem.

Thanks anyway